JP4645023B2 - Imaging device and portable terminal equipped with the same - Google Patents

Description

  The present invention relates to focus adjustment of an imaging device, and more particularly to a mechanism for close-up photography of an imaging device built in a portable terminal.

  Small and thin imaging devices have been installed in small and thin electronic devices such as mobile phones and PDAs (Personal Digital Assistants). As a result, not only audio information but also image information can be transmitted to a remote place.

  The imaging devices incorporated in these portable terminals have a very short focal length of the imaging optical system, and Fno. Is about 2 to 4, the depth of focus on the image side becomes very shallow, and strict accuracy is required for positioning the imaging optical system with respect to the imaging surface in the optical axis direction. For this reason, various proposals have been made regarding the position setting method of the imaging optical system of the imaging apparatus.

  For example, in order to eliminate the need for focus adjustment at the time of manufacturing the imaging device, the leg formed integrally with the optical member is brought into contact with the imaging element, and the optical member is biased toward the imaging element by an elastic member. An apparatus that positions an imaging element and an optical member in the optical axis direction is disclosed (for example, see Patent Document 1).

Also, the projection lens and the cylindrical holder are formed with protrusions and inclined grooves, and by rotating the photographic lens, the photographic lens is moved in the optical axis direction to adjust the focus during assembly. What enables close-up photography using a mechanism is disclosed (for example, see Patent Document 2).
JP 2002-325193 A JP 2002-82271 A

  Imaging devices mounted on the above-described mobile terminals are also required to have high image quality and multi-functionality as the penetration rate increases, and imaging devices capable of mounting an image sensor with a high number of pixels and performing close-up shooting (macro shooting) are available. It is requested.

  For high image quality, an image sensor with a large number of pixels is used, and in response to this, a plurality of optical members are made in order to make the image pickup optical system have high resolution, and the optical members are positioned with each other. Accurate positioning in the optical axis direction with respect to the image pickup element of the image pickup optical system composed of optical members is required.

  In addition, regarding macro photography, the amount of movement in the optical axis direction of the imaging optical system with respect to the imaging surface and the set position thereof are required to be extremely strict as described above.

  On the other hand, the image pickup apparatus described in Patent Document 1 does not require an adjustment process for positioning the image pickup element and the optical member in the optical axis direction, and is a simple and effective method. It has not yet been moved.

  Further, when the protrusion and the inclined groove are configured to be relatively movable as in the image pickup apparatus described in Patent Document 2, the inclined groove is necessarily formed with a clearance with respect to the size and shape of the protrusion. If the imaging device is facing upward, the projection will be in contact with the lower side of the inclined groove, and when the imaging device is downward, the projection will be in contact with the upper side of the tilting groove, and the focus will be shifted by the clearance. A difference problem occurs.

In view of the above problems, the present invention has a simple configuration, does not cause a difference in posture, can accurately position the image sensor and the image pickup optical system in the optical axis direction, and can cope with an increase in the number of pixels of the image sensor. it is an object of the present invention to obtain a portable terminal end having a photographable imaging apparatus and the imaging apparatus.

  The above object is solved by the following configuration.

1) an imaging device, a pedestal on which a leg portion that contacts the imaging device is formed, an imaging optical system that forms an abutting portion that contacts the pedestal and guides subject light to an imaging region of the imaging device, and an elastic member And in the optical axis direction of the imaging optical system, the pedestal is disposed between the imaging element and the imaging optical system, and at least a contact portion between the pedestal and the imaging optical system An inclined surface or an inclined surface and a horizontal plane are formed on one side, and the imaging optical system is moved along an optical axis by rotating either the pedestal or the imaging optical system, and the elastic member is Even if the imaging optical system and the pedestal are arranged to be urged in the direction of the imaging element, and the urging force of the elastic member rotates either the pedestal or the imaging optical system, the leg portion The state in contact with the image sensor can be maintained. An imaging apparatus characterized by that.

2) The imaging device according to 1) having an outer frame member that includes the imaging optical system .

3) An imaging element, a pedestal on which a leg part that contacts the imaging element is formed, an imaging optical system that forms an abutting part that contacts the pedestal and guides subject light to the imaging region of the imaging element, and an elastic member And an outer frame member containing the imaging optical system, and the pedestal is disposed between the imaging element and the imaging optical system in the optical axis direction of the imaging optical system, and the pedestal Forming a step at a contact portion with the imaging optical system, forming an inclined surface at a position corresponding to the step on the inner periphery of the outer frame member, and rotating the imaging optical system The imaging optical system is configured to move along the optical axis, and the elastic member is arranged to urge the imaging optical system and the pedestal toward the imaging element, and the imaging is performed by the urging force of the elastic member. The leg is in contact with the image sensor even when the optical system is rotated. Can be maintained.

  4) The imaging apparatus according to any one of 1) to 3), wherein the imaging optical system includes a plurality of optical members, and the optical members are in contact with each other.

  5) The imaging apparatus according to any one of 1) to 4), wherein a part of an optical member constituting the imaging optical system is formed on the pedestal.

6) The imaging device according to any one of 1) to 5), wherein a light-transmitting flat plate portion is integrally formed on the pedestal.

  7) The imaging device according to any one of 1) to 6), wherein an infrared light cut filter is formed on the pedestal.

  8) The imaging device according to any one of 1) to 7), wherein the elastic member is a coil spring, and a contact portion of the coil spring with the imaging optical system is formed to be in contact with a portion other than an end face.

  9) The elastic member is a coil spring, and the winding direction of the coil spring is the same as the rotation direction when the imaging optical system moves in a direction away from the imaging element. Imaging device.

  10) The imaging device according to any one of 1) to 9), wherein the elastic member is a coil spring, and a washer is disposed between the elastic member and the imaging optical system pressed by the coil spring.

  11) A portable terminal including the imaging device according to any one of 1) to 10).

  12) A step of fixing the outer frame member to the substrate having the imaging element, a step of fitting a pedestal to the outer frame member, a step of mounting an imaging optical system on the pedestal, and an elastic member for the imaging optical An imaging device manufacturing method comprising: a step of placing on a system; and a step of fixing a lid member to the outer frame member while pressing the other end of the elastic member.

  13) The imaging device manufacturing method according to 12), wherein in the step of fitting a pedestal to the outer frame member, a phase in the circumferential direction of the pedestal with respect to the outer frame member is selected and fitted.

An imaging device according to the present invention, a pedestal formed with a leg portion that contacts the imaging device, an imaging optical system that forms an abutting portion that contacts the pedestal and guides subject light to the imaging region of the imaging device, and an elastic member The pedestal is disposed between the imaging element and the imaging optical system in the optical axis direction of the imaging optical system, and an inclined surface or an inclined surface is provided on at least one of the contact portions between the pedestal and the imaging optical system. A horizontal plane and rotating the pedestal or the imaging optical system to move the imaging optical system along the optical axis, and the elastic member, the imaging optical system and the pedestal in the direction of the imaging device An imaging device that is arranged to be biased and can maintain the state where the leg portion is in contact with the imaging element even if either the base or the imaging optical system is rotated by the biasing force of the elastic member. With a simple configuration, there is no difference in posture, and Capable of relative positioning of the image optical system, it is possible to obtain the macro shooting imaging device capable to accommodate to increased number of pixels of the image sensor.

Alternatively, an imaging element, a pedestal on which a leg part that contacts the imaging element is formed, an imaging optical system that forms an abutting part that contacts the pedestal and guides subject light to an imaging region of the imaging element, and an elastic member, An outer frame member containing the imaging optical system, and a pedestal is disposed between the imaging element and the imaging optical system in the optical axis direction of the imaging optical system, and the pedestal is in contact with the imaging optical system. A step is formed at the contact portion, an inclined surface is formed at a position corresponding to the step on the inner periphery of the outer frame member, and the imaging optical system is moved along the optical axis by rotating the imaging optical system. The elastic member is arranged so as to urge the imaging optical system and the pedestal in the direction of the imaging element, and the leg portion is in contact with the imaging element even if the imaging optical system is rotated by the urging force of the elastic member. An imaging device that can be maintained also has a simple configuration, does not cause a difference in posture, and takes an image. Capable of relative positioning of the element and the imaging optical system, it is possible to obtain the macro shooting imaging device capable to accommodate to increased number of pixels of the image sensor.

  Hereinafter, the present invention will be described in detail with reference to embodiments, but the present invention is not limited thereto.

  FIG. 1 is a diagram showing an external appearance of a mobile phone T that is an example of a mobile terminal in which an imaging device of the present invention is built.

  In the mobile phone T shown in FIG. 1, an upper casing 71 as a case having a display screen D and a lower casing 72 having an operation button P are connected via a hinge 73. The imaging device S is built below the display screen D in the upper casing 71, and is arranged so that the imaging device S can capture light from the outer surface side of the upper casing 71.

  Below the display screen D of the upper casing 71, an arcuate opening 74 and the operation member 15 are disposed so as to be exposed from the opening 74. By moving the operation member 15 upward in the drawing within the opening 74, the focus position at the time of macro photography is set.

  Note that the position of the imaging device may be arranged above or on the side of the display screen D in the upper casing 71, and the same applies to the position of the operation member 15. Of course, the mobile phone is not limited to a folding type.

(First embodiment)
A first embodiment of the imaging apparatus of the present invention will be described below.

  FIG. 2 is a perspective view of the imaging apparatus 100 according to the first embodiment of this invention. The imaging apparatus 100 in the figure corresponds to the imaging apparatus S in FIG.

  As shown in FIG. 2, the outer surface of the image pickup apparatus 100 includes a printed circuit board 11 on which an image sensor is mounted, a connect board 17 for connection to another control board of the mobile terminal, and the printed board 11 and the connect board 17. It is formed integrally with the outer frame member 12 including the flexible printed circuit board FPC to be connected, the imaging optical system and the like and having the opening 12k on the side surface, the lid member 13 incorporated in the upper surface of the outer frame member 12, and the outer frame member 12. The operation member 15 is rotatably mounted on the boss 12b, and the stepped screw 16 is configured to fix the operation member 15 to be rotatable.

  FIG. 3 is a cross-sectional view of the imaging device 100 taken along line DD shown in FIG.

  As shown in FIG. 3, the inside of the outer frame member 12 includes a first lens 1 from the subject side, an aperture stop 4 that determines the aperture F value of the imaging optical system, a second lens 2, and a fixed aperture 5 for blocking unnecessary light. , A third lens 3, an imaging optical system 50, a pedestal 6, an infrared cut filter 7, an imaging element 8 mounted on a printed board 11, a compression coil spring 9 that is an elastic member, a washer 10, and a lid member 13.

  In the figure, a pedestal 6 according to the present invention is formed with a leg portion 6d in contact with an image sensor on the image plane side. On the imaging optical system 50 side, horizontal surfaces 6a and 6b having different heights and inclined surfaces 6c (hereinafter referred to as cam surfaces) that continuously connect the horizontal surfaces are formed at approximately 120 ° intervals. Further, a recess 6e is formed on the side surface of the pedestal 6, and an outer periphery of the outer frame member 12 is fitted with the recess 6e of the pedestal 6, and at least a projection 12e that prohibits positioning and rotation of the pedestal 6 is provided. It is formed in one place.

  As shown in the figure, the imaging optical system 50 is a unit in which the first lens 1, the second lens 2, and the third lens 3 are brought into contact with each other at a flange portion other than the optically effective surface and are fixed to each other with an adhesive or the like. By constructing it without using other members, the distance between the lenses can be assembled without error.

  On the imaging surface side of the third lens 3 constituting the imaging optical system 50, protrusions 3a are formed at intervals of approximately 120 °, and are arranged corresponding to the cam surfaces formed on the pedestal 6, and this protrusion 3a. This makes contact with the cam surface of the base 6. A gear portion 3 g is formed on the side surface of the flange portion of the third lens 3.

  Further, a washer 10 is disposed on the object side of the flange portion of the third lens 3, and a compression coil spring 9 is incorporated between the lid member 13 and the washer 10. The imaging optical system 50 and the pedestal 6 are urged toward the imaging element 8 by the compression coil spring 9.

  On the other hand, the gear portion 15 g formed on the operation member 15 that can be rotated by the stepped screw 16 is arranged to mesh with the gear portion 3 g of the third lens 3. The operation member 15 exposed from the opening 74 of the mobile terminal T shown in FIG. 1 is the tip 15r of the operation member 15 shown in FIG. 3, and this is a part operated by the user.

  An operation of the imaging apparatus 100 configured as described above will be described.

  When the distal end portion 15r of the operation member 15 is operated, the operation member 15 rotates about the stepped screw 16, and the third lens 3 is rotated by the gear portion 3g of the third lens 3 meshed with the gear portion 15g. Move. For this reason, the protrusions 3a arranged at intervals of about 120 ° move from the horizontal surface 6a of the cam surface arranged at intervals of about 120 ° to the pedestal 6 to the horizontal surface 6b separated from the image sensor 8 via the inclined surface 6c. As a result, the imaging optical system 50 moves a predetermined amount in the optical axis direction and is set to a position suitable for short-distance shooting.

  At this time, the compression coil spring 9 which is an elastic member according to the present invention urges the imaging optical system 50 and the pedestal 6 in contact with the imaging element 8 from the beginning. For this reason, the imaging optical system 50 can maintain a constant distance from the imaging element 8 in any posture without tilting, and obtain an imaging device capable of macro photography that solves the problem of the posture difference. be able to.

  Further, since the imaging optical system 50 is held in the outer frame member 12 via the elastic member 9, an impact or an external pressure is applied to the outer frame member 12 when the imaging device 100 is transferred or incorporated into a portable terminal. Even in this case, the force is not directly transmitted to the internal imaging optical system 50 and the pedestal 6, and the imaging optical system 50 and the pedestal 6, which are the main parts, can be made a reliable imaging device without any deviation.

  Similarly, the rotation of the distal end portion 15r of the operation member 15 described above is restricted by the opening 74 of the portable terminal T, and even if a large acting force is applied to the distal end portion 15r, the opening 74 receives the force, and imaging optics. Since it is not transmitted to the system 50, it is possible to make the structure difficult to break down.

  Furthermore, the leg portion 6d of the pedestal 6 abuts at a portion outside the light receiving surface of the image sensor 8, and the infrared light cut filter 7 is disposed on this pedestal so that the light receiving surface side of the image sensor 8 can be enclosed. It is possible to prevent dust entering from the outside and dust generated by operation from adhering to the light receiving surface.

  FIG. 4 is a diagram illustrating an example of a cam surface formed on the base 6. This figure is a developed view (cam diagram) of a cam surface formed in a cylindrical shape. The cam diagram is exaggerated in the height direction.

  As shown in the figure, three types of cam shapes indicated by A, B shapes, and C shapes are formed 120 degrees apart from each other. The cam shapes A, B, and C are formed so that the heights of the horizontal planes are different from each other, while the height difference (shown by d) of the paired horizontal planes is formed with the same dimension. Each cam has a use area (shown by A) of approximately 30 ° and a nonuse area (shown by B) of 10 °. When used in the imaging apparatus shown in FIG. 3, the rotation angle of the imaging optical system 50 is set to be slightly less than 30 °.

  With these three types of cam shapes, when the distance from the final surface of the imaging optical system 50 to the focal position is assembled in the vicinity of the design value, the protruding portion 3a of the third lens 3 comes into contact with the cam shape B. Assembled. When the distance from the final surface of the image pickup optical system 50 to the focal position is shorter than the design value, the projection 3a of the third lens 3 is assembled so as to come into contact with the cam shape A. In addition, when the distance from the final surface of the imaging optical system 50 to the focal position becomes longer than the design value, the projection 3a of the third lens 3 is assembled so as to abut the cam shape C.

  These may be measured for each imaging optical system, and the corresponding cam surface may be selected, or may be set in units of lots.

  Further, the pedestal 6 on which the cam surface is formed has at least three concave portions 6e described above in increments of 40 °, and the third lens is selected by selecting the concave portion that fits the convex portion 12e of the outer frame member 12. The cam surface that comes into contact with the three protrusions 3a can be selected.

  That is, by selecting and fitting the circumferential phase of the pedestal 6 with respect to the outer frame member 12, the cam surface to be used is selected corresponding to the variation in the focal position of the imaging optical system 50 assembled in advance. This eliminates variations in in-focus subject distance between distance shooting and macro shooting.

  In addition, although it demonstrated by what formed the 3 types of cam surfaces in the base 6, it does not restrict to 3 types. Further, the rotation angle is appropriately set according to this.

  Next, the assembly of the imaging apparatus 100 configured as described above will be described below.

  FIG. 5 is a diagram illustrating the assembly order of the imaging apparatus 100. For simplification of description, the same reference numerals are given to the same functional members as those in FIGS. 2 and 3 for description.

  (1) A printed circuit board unit is prepared in which a printed circuit board 11 on which an image sensor 8 is mounted at a predetermined position and a connect circuit board 17 for connection to another control circuit board of a mobile terminal are connected by a flexible printed circuit board FPC. .

  (2) The outer frame member 12 is fixed to the printed circuit board 11. The outer frame member 12 is positioned, and the printed circuit board 11 and the outer frame member 12 are fixed with an adhesive. For this positioning, for example, the position of the image pickup device 8 is image-recognized by a camera prepared as a process jig, and the image pickup device 8 that has been image-recognized is accurately positioned. If such accuracy is not required, positioning may be performed by a positioning hole formed in the printed board 11 and a boss formed in the outer frame member 12 although not shown.

  (3) The base 6 on which the infrared light cut filter 7 is assembled in advance is fitted into the outer frame member 12. At this time, the protrusion 12e (see FIG. 3) provided on the inner periphery of the outer frame member 12 and the recess 6e provided in three places on the base 6 are fitted into a predetermined recess and incorporated. . Which of the recesses 6e is selected is determined by measuring the imaging optical system 50 in advance as described above.

  (4) On the cam surface of the pedestal 6, the imaging optical system 50 assembled as a unit in advance is placed. At this time, the three protrusions 3 a formed on the third lens are in a predetermined position on the cam surface, and the gear portion 3 g is assembled so as to face the opening 12 k of the outer frame member 12.

  (5) The washer 10 is placed on the flange portion of the third lens of the imaging optical system 50.

  (6) The elastic member 9 is placed on the imaging optical system 50. The elastic member 9 is placed via the washer 10.

  (7) The lid member 13 is fixed to the outer frame member 12 while pressing the other end of the elastic member 9. This fixing is performed with an adhesive or the like.

  (8) The operation member 15 is assembled to the boss 12b of the outer frame member 12. At this time, the gear portion 15g formed on the operation member 15 and the gear portion 3g formed on the third lens are aligned with each other so that the teeth engage with each other, and then rotated by the stepped screw 16. Can be assembled as possible.

  The above is the manufacturing method of the imaging device of the present invention. In this way, by sequentially placing them from one direction, it is easy to apply automatic assembly by a machine, the cost can be reduced, and an increase or decrease in the number of production can be quickly handled.

  In addition, although it demonstrated by the structure which formed the cam surface in the base 6 and had the projection part 3a in the imaging optical system 50 side, it is not restricted to this, A projection part is provided in the base 6 and a cam surface is provided in the imaging optical system side. You may form, or you may form a cam surface in both. Further, the pedestal 6 cannot be rotated and the imaging optical system 50 is rotated. However, the present invention is not limited thereto, and conversely, the imaging optical system 50 may be disabled and the pedestal 6 may be rotated. . In addition, the description has been given of the cam surface having a shape in which horizontal surfaces having different heights are connected by the inclined surface, but it is needless to say that the cam surface may be formed only by the inclined surface.

  Next, another example of the first embodiment will be described.

  FIG. 6 is a cross-sectional view showing another structure of the imaging apparatus of the present invention. This figure shows another configuration with the concept of the configuration of the imaging apparatus shown in FIG. 3 as it is.

  The imaging device 150 shown in the figure is one in which the pedestal and the elastic member are not arranged around the imaging optical system but on one side. For simplification of description, the same reference numerals are given to members having the same functions even if the shapes are different from those in FIG.

  The imaging device 150 includes an outer frame member 12 having an opening 12k and a shaft 14 assembled to a printed circuit board 11 on which the imaging element 8 is mounted. The horizontal planes 6a and 6b having different heights about the shaft 14 A pedestal 6 having an inclined surface 6c (hereinafter referred to as a cam surface) that connects the horizontal planes is made rotatable, and the other surface 6d of the pedestal 6 is disposed so as to contact the image pickup device 8. The pedestal 6 is integrated with the operation member, and the tip 15r is exposed from the opening 74 shown in FIG. On the other hand, the third lens 3 on which the guide tube 3s is formed is fitted to the shaft 14, and the protrusion 3a is brought into contact with the cam surface. The third lens 3 is non-rotatable by a rotation stopper (not shown) and is movable only in the optical axis direction. The compression coil spring 9, which is an elastic member, is arranged around the guide tube 3 s, and the third lens is fixed by the compression coil spring 9 by fixing the other end of the shaft 14 with the lid member 13 assembled with the infrared light cut filter 7. 3 and the pedestal 6 are urged toward the image sensor 8.

  In this imaging device 150, by operating the tip 15r, the base 6 rotates about the shaft 14, and the projection 3a of the third lens 3 contacts the cam surface of the base 6 through 6a to 6c and 6b. Thus, the imaging optical system is moved to the subject side by the difference in the height of the cam surface. This enables macro shooting.

  In this case, it is essential that the protrusion 3a is formed integrally with the third lens 3, but the guide tube 3s may be formed of a separate part.

  In order to eliminate the variation in the focal position of the imaging optical system, the cam surface of the pedestal 6 is prepared at various heights, and is appropriately selected and used corresponding to the imaging optical system.

  Also in this case, the imaging optical system can always keep the distance from the imaging device 8 in any posture, and an imaging device capable of macro photography can be obtained while solving the problem of the posture difference. it can.

(Second embodiment)
A second embodiment of the imaging apparatus of the present invention will be described below.

  FIG. 7 is a cross-sectional view of the imaging apparatus 200 according to the second embodiment of the present invention. The imaging apparatus 200 in the figure corresponds to the imaging apparatus S in FIG. For the sake of simplification of explanation, the same reference numerals are given to members having the same functions as those in FIG.

  An imaging optical system 50 including a first lens 1 from the object side, an aperture stop 4 for determining an aperture F value of the imaging optical system, a second lens 2, a fixed aperture 5 for blocking unnecessary light, and a third lens 3; , Pedestal 6, infrared light cut filter 7, image sensor 8 mounted on printed circuit board 11, compression coil spring 9 as an elastic member, washer 10, and lid member 13.

  In the figure, a pedestal 6 according to the present invention is formed with a leg portion 6d in contact with an image sensor on the image plane side. On the imaging optical system 50 side, horizontal surfaces 6a and 6b having different heights and inclined surfaces 6c (hereinafter referred to as cam surfaces) that continuously connect the horizontal surfaces are formed at approximately 120 ° intervals.

  Furthermore, in this embodiment, as shown in the drawing, the pedestal 6 is integrally formed with a part of the outer frame member including the boss 12b for assembling the operation member 15. The pedestal 6 is formed of a light-shielding material, and a portion located at the upper part of the image sensor is an opening, and an infrared cut filter 7 is assembled to the opening.

  The pedestal 6 is formed so that the leg portion 6d abuts on the image sensor 8 and other portions have a slight gap with the printed circuit board 11, and when assembled to the printed circuit board 11, the same process as described above is performed. The position of the image sensor 8 is image-recognized by a camera prepared as a jig for use, and the image sensor 8 that has been image-recognized is positioned accurately by being placed at a predetermined position. If such accuracy is not required, positioning may be performed by fitting a hole (not shown) provided in the printed board 11 and a boss (not shown) provided on the base 6. Thereafter, the base 6 is fixed by adhesion.

  After fixing the pedestal, the imaging device 50 is placed, the washer 10 and the compression coil spring 9 are assembled, and the lid member 13 having the opening 12k is put on.

  The names, functions, and operations of the other parts of the image capturing apparatus 200 are the same as those of the image capturing apparatus 100, and thus are omitted.

  With this configuration, an imaging apparatus capable of macro shooting can be obtained while solving the problem of the posture difference, as described above. Further, the number of parts can be reduced as compared with the imaging apparatus 100, and the cost can be reduced.

  In the above description, the cam surface is formed on the pedestal 6 and the protrusion is provided on the imaging optical system 50 side. However, the present invention is not limited thereto, and the protrusion is provided on the pedestal 6 to form the cam surface on the imaging optical system side. Or a cam surface may be formed on both. In addition, the description has been given of the cam surface having a shape in which horizontal surfaces having different heights are connected by the inclined surface, but it is needless to say that the cam surface may be formed only by the inclined surface.

(Third embodiment)
A third embodiment of the imaging apparatus of the present invention will be described below.

  The configuration of the main components of the imaging apparatus according to the third embodiment is the same as that of the imaging apparatus 100 shown in FIG. 3, and different parts will be described with reference to FIG.

  The imaging device according to the present embodiment is different in the shape of the cam surface of the pedestal 6 shown in FIG. 3 and the shape of the outer frame member 12 facing the pedestal, and this part will be described in detail with reference to FIGS. 8 and 9. explain.

  FIG. 8 is a diagram showing the shape of the cam surface formed on the base 6 according to the third embodiment of the present invention. This figure is a developed view (cam diagram) of a cam surface formed in a cylindrical shape. The cam diagram is exaggerated in the height direction.

  As shown in the figure, the three types of shape indicated by A, shape indicated by B, and shape indicated by C are stepped with a step, and are formed 120 ° apart from each other. Hereinafter, it is referred to as a step, not a cam surface.

  The step shapes A, B, and C are formed so that the heights of the horizontal planes are different from each other, while the height difference (indicated by d) of the paired horizontal planes is formed with the same dimension. Each step has a use area (shown by A) of approximately 30 ° and a nonuse area (shown by B) of 10 °. When used in the image pickup apparatus shown in FIG. 3, the rotation angle of the image pickup optical system 50 is less than 30 °.

  FIG. 9 is a perspective view showing a pair of steps of the base 6 and the shape of the outer frame member at a position corresponding to the pair of steps.

  As shown in the figure, the pedestal 6 has a notch formed at a position corresponding to a step between a pair of low horizontal surface a and high horizontal surface b. On the other hand, on the inner periphery of the outer frame member 12, a mountain-shaped inclined surface 12s that connects the horizontal plane a to the horizontal plane b is formed at a position corresponding to the notch. Reference numeral 3a denotes a protrusion formed on the third lens.

  The operation in such a configuration will be described. When the operation member 15 shown in FIG. 3 is rotated, the third lens meshing with the operation member 15 is rotated. At this time, the protrusion 3a formed integrally with the third lens moves to the left in the figure on the step, and when it hits the inclined surface 12s, it is lifted along this inclination, and at a position deviated from the inclined surface 12s, Stop on the horizontal plane b (indicated by a broken line). As a result, the imaging optical system moves toward the object side by the difference in level difference, and is set to the focus position for macro photography.

  The inclined surfaces 12s formed on the inner periphery of the outer frame member 12 are provided at three locations corresponding to the notches of the pedestal 6, thereby making it impossible to rotate the pedestal 6, and the convexity shown in FIG. The part 12e is not necessary. The notch portion of the pedestal 6 is provided at each step, that is, in increments of 40 °, and is used to select the step A, B, C in the circumferential direction of the pedestal 6 with respect to the outer frame member 12.

  These three types of step shapes are assembled so that the protrusion 3a of the third lens contacts the step shape B when the distance from the final surface of the imaging optical system 50 to the focal position is assembled in the vicinity of the design value. . When the distance from the final surface of the imaging optical system 50 to the focal position becomes shorter than the design value, the projection 3a of the third lens is assembled so as to contact the stepped shape A. In addition, when the distance from the final surface of the imaging optical system 50 to the focal position becomes longer than the design value, the third lens protrusion 3a is assembled to the stepped shape C.

  In addition, although it demonstrated by what formed three types of level | step differences in the base 6, it does not restrict to three types. Further, the rotation angle is appropriately set according to this.

  FIG. 10 is a cross-sectional view showing the shape of a compression coil spring applied to the imaging devices 100 and 200 of the present invention. The compression coil spring 9 in FIG. 10A is obtained by bending the end 9m. Further, the compression coil spring 9 of FIG. 10 (b) is obtained by scraping the surface in contact with the member to which the wire forming the spring is biased so as to be flat.

  By machining the end of the coil spring so that it does not come into contact with the portion receiving the biasing force of the imaging optical system as shown in the figure, it is possible to smooth the operation of the contact portion and to prevent generation of dust caused by wear of the contact portion. . By doing so, the above-described washer can be abolished.

  Also, the winding direction of the compression coil spring is the same as the rotation direction when the imaging optical system moves away from the image sensor, and the end portion is not caught in the rotation direction in which the urging force increases. It is possible to abolish the aforementioned washer.

  In the imaging devices of the first to third embodiments described above, the imaging optical system 50 has been described as having a three-sheet configuration, but is not limited to this and can be applied to either a single lens or a multiple-sheet configuration. Needless to say. Further, although the entire group feeding is performed by moving the imaging optical system 50 integrally, a lens is formed on the pedestal 6 in the case of a plurality of sheets, and the front group feeding is performed by moving the optical system arranged in front of the pedestal. It is also applicable to the configuration. In the case of front group extension, macro photography can be performed with a smaller movement amount than the entire group extension.

  In the imaging devices according to the first to third embodiments, the compression coil spring is used as the elastic member. However, the present invention is not limited to this, and a plate spring or a sponge-like member can also be applied. Needless to say, the imaging optical system may be configured to contact the pedestal using a coil spring. Furthermore, although the site | part pressed with an elastic member was demonstrated as a flange part of a 3rd lens, even if it comprises so that a 1st lens or a 2nd lens may be pressed, it does not deviate from this invention.

  Furthermore, in the infrared light cut filter described in the first embodiment and the third embodiment, the pedestal is formed so as to cover the upper surface of the image sensor with a translucent material, and the infrared light cut characteristic is achieved. You may give it a coating. As described above, by arranging the infrared light-cutting functional member between or behind the optical systems, there is an effect that the thickness of the entire imaging apparatus can be reduced as compared with the case where the functional members are arranged on the front surface of the imaging optical system. . Note that a configuration in which a flat plate portion that covers the upper surface of the imaging element with a translucent material is integrally formed and an infrared light cut filter is disposed in front of the first lens does not depart from the present invention.

It is a figure which shows the external appearance of the mobile telephone T which is an example of the portable terminal which incorporated the imaging device of this invention. 1 is a perspective view of an imaging apparatus 100 according to a first embodiment of the present invention. FIG. 3 is a cross-sectional view of the imaging apparatus 100 taken along line DD shown in FIG. It is a figure which shows the example of the cam surface formed in a base. 3 is a diagram illustrating an assembly order of the imaging apparatus 100. FIG. It is sectional drawing which showed the other structure of the imaging device of this invention. It is sectional drawing of the imaging device 200 of 2nd embodiment of this invention. It is a figure which shows the shape of the cam surface formed in the base which concerns on 3rd embodiment of this invention. It is the perspective view which showed the shape of the outer frame member of the position corresponding to a pair of level | step difference of a base. It is sectional drawing which showed the shape of the compression coil spring applied to the imaging devices 100 and 200 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st lens 2 2nd lens 3 3rd lens 4 Aperture stop 5 Fixed stop 6 Base 7 Infrared light cut filter 8 Image sensor 9 Elastic member 10 Washer 11 Printed circuit board 12 Outer frame member 13 Lid member 14 Shaft 15 Operation member 16 Stepped screw 50 Imaging optical system 100, 150, 200 Imaging device T Mobile phone

Claims (11)

An imaging device, a pedestal formed with a leg portion that contacts the imaging device, an imaging optical system that forms an abutting portion that contacts the pedestal and guides subject light to the imaging region of the imaging device, and an elastic member; Have
The pedestal is disposed between the imaging element and the imaging optical system in the optical axis direction of the imaging optical system;
An inclined surface or an inclined surface and a horizontal plane are formed on at least one of the contact portions between the pedestal and the imaging optical system, and the imaging optical system is lighted by rotating either the pedestal or the imaging optical system. Configured to move along an axis,
The elastic member may be arranged so as to urge the imaging optical system and the pedestal toward the imaging element, and either the pedestal or the imaging optical system may be rotated by the urging force of the elastic member. An imaging apparatus characterized in that the leg portion is maintained in contact with the imaging element. The imaging apparatus according to claim 1, further comprising an outer frame member that includes the imaging optical system. An imaging device, a pedestal formed with a leg portion that contacts the imaging device, an imaging optical system that forms an abutting portion that contacts the pedestal and guides subject light to the imaging region of the imaging device, and an elastic member; An outer frame member containing the imaging optical system,
The pedestal is disposed between the imaging element and the imaging optical system in the optical axis direction of the imaging optical system;
The pedestal forms a step at a contact portion with the imaging optical system,
An inclined surface is formed at a position corresponding to the step on the inner periphery of the outer frame member,
The imaging optical system is configured to move along the optical axis by rotating the imaging optical system,
The elastic member is disposed so as to urge the imaging optical system and the pedestal in the direction of the imaging element, and the leg portion remains in the imaging element even when the imaging optical system is rotated by the urging force of the elastic member. An image pickup apparatus capable of maintaining a state in contact with the image pickup apparatus. The imaging apparatus according to claim 1, wherein the imaging optical system includes a plurality of optical members, and the optical members are in contact with each other. The imaging apparatus according to any one of claims 1 to 4, wherein a part of an optical member constituting the imaging optical system is formed on the pedestal. The imaging apparatus according to claim 1, wherein a translucent flat plate portion is integrally formed on the pedestal. The imaging apparatus according to claim 1, wherein an infrared light cut filter is formed on the pedestal. The said elastic member is a coil spring, and the contact part with the said imaging optical system of this coil spring is formed so that it may contact in parts other than an end surface, The one of Claims 1-7 characterized by the above-mentioned. Imaging device. The said elastic member is a coil spring, The winding direction of this coil spring is the same direction as the rotation direction when the said image pick-up optical system moves to the direction away from an image pick-up element. The imaging device according to any one of the above. The image pickup apparatus according to claim 1, wherein the elastic member is a coil spring, and a washer is disposed between the elastic member and the image pickup optical system pressed by the coil spring. A portable terminal comprising the imaging device according to claim 1.

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